In many modified applications, it's impossible to buy an "off-the-shelf" converter and expect it to be right. The only way to tailor the converter to your combination is to check with the respective converter manufacturers. How many combinations are possible? They're countless. For example, ATI builds hundreds of different 8-inch race converters. They have taken the time to computerize over 7,000 different vehicle combinations so that the right converter is manufactured for a given combination.